A man sits writing in a pithouse of Step House, a cliff dwelling in Mesa Verde National Park. The sides of the pithouse are lined with small slabs of sandstone. Additional portions of the cliff dwelling are being excavated behind where the man...

Mountain States Telephone and Telegraph workers position a pole in an excavated hole near a dirt road and field probably in Colorado. A group of men lift the pole while another stands by with a prop. A barn, house, and fields are in the distance.

A cement mixer truck is positioned to pour concrete piers at the construction site of Swedish Hospital (Swedish Medical Center) in Englewood (Arapahoe County), Colorado. The piers are situated in an excavated basement. The Swedish Hospital building...

Construction workers create forms for the foundation of a building at Swedish Hospital (Swedish Medical Center) in Englewood (Arapahoe County), Colorado. They stand in an excavated basement near wood bracing and boards.

Construction workers stand in trench excavated to re-route the Eagle River near Pando at Camp Hale (Eagle County), Colorado. An excavator reads: "Platt Rogers, Pueblo, Colorado No.1" and a crane is in the distance. Shows workers and trucks in the...

View Tyuonyi ruins, Native American (Anasazi) pueblo ruins, near Frijoles Canyon, Bandelier National Park, New Mexico. The ruins stand half excavated and in a semicircular pattern. One kiva hole is visible. A dirt road leads to the ruins. A wall of...

Shows the ruins of Cliff Palace at Mesa Verde National Park, including the Round Tower. A massive, rock overhang above the cliff dwelling was excavated by archaeologist Jesse Fewkes in 1909. Several kivas lie close to the edge of the dwelling. Snow...

Deric Nusbaum, Jesse Nusbaum's stepson, stands with two younger boys on top of a portion of the excavated Aztec Ruins near the Animas River in northern New Mexico. A car, possibly a Model T Ford, and a truck are parked near the ruins where the...

Construction workers stand on a platform set on scaffolding in the excavated basement of a building under construction at Swedish Hospital (Swedish Medical Center) in Englewood (Arapahoe County), Colorado. Shows piers set into the basement floor....

Two white men stand near a Native American (Shoshone or Bannock) bath in an area covered with tall grass and bushes. The bath is covered with a wooden frame. One man wears a military uniform. The other man wears a suit.

View of the toll road built between Ouray and Ironton by Otto Mears. The dirt road was excavated into the side of the Uncompahgre Gorge beside the Uncompahgre River in Ouray County, Colorado. A saddled horse and a wagon are on the road. Rivulets of...

View of the Golconda Group Mine near Summitville in Rio Grand County, Colorado. A sluice box sits in an excavated trench. Men work near the trench. Mount Hesperus (Hesperus Mountain) is in the distance.

Aerial view of brick and stone buildings on Broadway in downtown Los Angeles, California. Buildings include the Hotel Aberdeen and the Women's Christian Temperance Union building with a rounded corner and a balustrade on the cornice. Signs read:...

Deric Nusbaum, Jesse's stepson, stands between two pack horses in Navajo Canyon. Three men stand with Deric. The man on the far left holds a large pot in his hand, possibly an antiquity excavated from a ruin for the Mesa Verde National Park...

Workers with shovels stand on a pile of dirt on the construction site of Swedish Hospital (Swedish Medical Center) in Englewood (Arapahoe County), Colorado. Large holes have been excavated, probably for planting nearby trees. A man wearing a suit...

Deric Nusbaum, Jesse's stepson, stands underneath the huge rock overhang at the site of Step House, a cliff dwelling at Mesa Verde National Park. He holds his left arm straight up to touch the rock overhang. The site has not been excavated. A man...

Two men stand near iron forms and lumber in an excavated ditch prepared for a pipeline for the Stanley Mine near Idaho Springs in Clear Creek County, Colorado. Workmen, a cart, railroad tracks and a wooden building are in the distance.

Men stand near a section of finished wooden pipe in an excavated ditch, part of a pipeline for the Stanley Mine near Idaho Springs in Clear Creek County, Colorado. Workmen, a cart, railroad tracks and a wooden building are in the distance.

View of an excavated area filled with brick rubble and wood joists at the site of the Colorado Telephone Company building at 1421 Champa Street, Denver, Colorado. A cut stone wall lines a portion of the hole. Bricks are stacked near a shed-roofed...

View of a chain link fence decorated with artificial flowers made of yarn by the Ladies Fancywork Society, at a Union Station construction site in the Union Station neighborhood, Denver, Colorado. The women of the society spent six weeks creating...

View of the former Douglas Hotel at 4050 Walnut Street in the Cole neighborhood of Denver, Colorado. Shows an abandoned building with broken windows and deteriorated paper advertisements for Barnes Circus and Jap Rose Soap. Sign painted on the side...

Overview of the local terrain in Dinosaur National Monument located off of Utah 149, 7 miles north of U.S. 40 in Utah and Colo. In 1915 President Woodrow Wilson set aside 80 acres around a dinosaur bone quarry in Utah. Twenty-three years later in...

View of a building under construction at Denver General Hospital at West 6th (Sixth) Avenue and Cherokee Street in the Lincoln Park neighborhood of Denver, Colorado. Shows excavated lower level, rebar, and framed footings.

A group of men work to excavate a room in the Bone Awl House, a cliff dwelling in Mesa Verde National Park. Deric Nusbaum, right, helps them in one of his first excavations under his stepfather Jesse's supervision. Several rooms have been excavated...

Men work in a tunnel excavated for Highway 6 in Jefferson or Clear Creek County, Colorado. They wear work clothes, hard hats, and electric mine lamps. Ankle deep water fills the cavern. Explosives are placed in holes that are drilled in the rock...

View of East Portal and the Black Canyon of the Gunnison (Montrose County), Colorado. Probably a powerhouse with smokestacks and other timber structures are built on excavated debris piles next to the Gunnison River. The vehicle adit for the...

View of a Native American (Anasazi) pueblo. The fully excavated Tyuonyi ruins in Frijoles Canyon, Bandelier National Monument, New Mexico stand near a group of trees and are surrounded by a dirt path. Three kiva holes are in the center of the...

View of the half excavated Tyuonyi ruins, Native American (Anasazi) pueblo ruins at Bandelier National Monument, New Mexico. Shows a semicircular ring of ruins, a one kiva entrance, dirt paths, and the north wall of Frijoles Canyon.

Profile views of three Native American (Ancestral Puebloan) skulls excavated from Cliff palace in Mesa Verde National Park and stored at the Denver Museum (Colorado History Museum), in Denver, Colorado.